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Marginal integrity between a prefabricated composite block and enamel, DEJ, and dentin
Morakot Piemjai1, Ariya Thaveeratana, Nobuo Nakabayashi
1Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, Patumwon, Bangkok 10330, Thailand. tmorakot@chula.ac.th
American Journal of Dentistry
|January 7, 2011
Summary
Superbond C&B demonstrated superior marginal integrity, showing no leakage at enamel, dentin, or DEJ interfaces after chemical challenge. Variolink II and Panavia Fluorocement showed degradation and leakage, particularly at dentin and DEJ interfaces.
Area of Science:
- Dental Materials Science
- Adhesive Dentistry
- Biomaterials Engineering
Background:
- Marginal integrity of dental restorations is crucial for longevity.
- Understanding interfacial stability between tooth substrates and adhesive systems is essential.
- Degradation of interfacial layers can lead to secondary caries and restoration failure.
Purpose of the Study:
- To evaluate the interfacial layer stability and leakage patterns of three adhesive systems (Superbond C&B, Panavia Fluorocement, Variolink II) in enamel, dentin, and dentin-enamel junction (DEJ).
- To assess the marginal integrity of restored tooth substrates under chemical challenge.
- To compare the performance of different adhesive systems at various tooth substrate interfaces.
Main Methods:
- Human molars were prepared with enamel, DEJ, and dentin surfaces and restored with composite blocks using three adhesive systems.
- Scanning Electron Microscopy (SEM) was used to investigate interfacial layers after chemical challenge.
- Leakage tests were performed using dye or silver nitrate solutions, with penetration depth measured and silver location detected by SEM.
Main Results:
- Superbond C&B (SB) showed stable hybridized enamel, dentin, and DEJ interfaces resistant to chemical challenge.
- Variolink II (VL) and Panavia Fluorocement (PN) exhibited degraded, detached, and thinner interfacial layers at the DEJ and dentin compared to enamel.
- No leakage was observed at the enamel-resin interface for any cement, nor at the DEJ- and dentin-resin interfaces for SB. VL showed significantly more leakage than PN at dentin and DEJ interfaces.
Conclusions:
- Superbond C&B provides superior marginal integrity and interfacial stability compared to Panavia Fluorocement and Variolink II.
- Variolink II and Panavia Fluorocement demonstrate susceptibility to degradation and leakage at the dentin and DEJ interfaces.
- Adhesive system choice significantly impacts the long-term marginal integrity of dental restorations, especially in dentin and DEJ regions.
